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While venous thrombosis of the legs is the most common form, venous thrombosis may occur in other veins. These may have particular specific risk factors: [5] Cerebral venous sinus thrombosis, cavernous sinus thrombosis and jugular vein thrombosis: thrombosis of the veins of the brain and head
Dozens of genetic risk factors have been identified, [14] and they account for approximately 50 to 60% of the variability in VTE rates. [4] As such, family history of VTE is a risk factor for a first VTE. [88] Factor V Leiden, which makes factor V resistant to inactivation by activated protein C, [88] mildly increases VTE risk by about three times.
The mainstay of VTE management is anticoagulation therapy, which prevents thrombus propagation and embolization. Such treatment reduces the risk of recurrence. [5] [4] [1] The choice and duration of anticoagulation depend on the individual patient's risk factors, bleeding risk, and preferences.
Anticoagulation for patients with lower extremity superficial thrombophlebitis at increased risk for thromboembolism (affected venous segment of ≥5 cm, in proximity to deep venous system, positive medical risk factors). [20] Treatment with fondaparinux reduces the risk of subsequent venous thromboembolism. [21]
Deep vein thrombosis/ right leg. Thrombophlebitis causes include disorders related to increased tendency for blood clotting and reduced speed of blood in the veins such as prolonged immobility; prolonged traveling (sitting) may promote a blood clot leading to thrombophlebitis but this occurs relatively less.
When venous thromboembolism occurs when a patient is experiencing transient major risk factors such as prolonged immobility, surgery, or trauma, testing for thrombophilia is not appropriate because the outcome of the test would not change a patient's indicated treatment.
These risk factors include age, cancer, history of thromboembolism, pregnancy, use of oral contraceptive medications (containing estrogen), [4] hormone replacement therapy, recent surgery, and certain autoimmune diseases (especially Behçet's and Buerger's diseases). [3] Other risk factors include immobilization (stasis) and laparoscopy. [1]
The presence of acquired risk factors for venous thrombosis—including smoking, use of estrogen-containing (combined) forms of hormonal contraception, and recent surgery—further increase the chance that an individual with the factor V Leiden mutation will develop DVT. [citation needed]